Self-evident, intuitively obvious.
Presumed without analysis.
Based on hypothesis and theory rather than experiment or empirical evidence.
Developed entirely from scratch, without deriving it from existing languages.
In a way based on theoretical deduction rather than empirical observation.
Clear or manifest to the understanding; plain; evident; obvious; known; palpable; indubitable.
Capable of being seen, or easily seen; open to view; visible to the eye, eyely; within sight or view.
Appearing to the eye or mind (distinguished from, but not necessarily opposed to, true or real); seeming.